This file is indexed.

postinst is in qemu-system-mips 1:2.1+dfsg-12+deb8u6.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh
set -e
# == begin update-alternatives maintscript fragment ==
# this should go away for jessie+1
if [ ".$1" = .configure ] && dpkg --compare-versions "$2" lt-nl "2.0.0~rc1+dfsg-2"
then
  for arch in mips mipsel mips64 mips64el ; do
    update-alternatives --remove qemu /usr/bin/qemu-system-$arch
  done
fi
# == end update-alternatives maintscript fragment ==